Content and carbon and oxygen isotope composition of total carbon, total non-carbonate carbon, and total inorganic carbon of basement rocks from the southern wall of the Atlantis Massif, IODP Expedition 357

The carbon geochemistry of serpentinized peridotites, gabbroic rocks, and sediments recovered during IODP Expedition 357 (October to December 2015) on the Atlantis Massif, Mid-Atlantic Ridge was examined to characterize carbon sources and the fate of dissolved organic (DOC) and inorganic carbon (DIC) in seawater during long-lived hydrothermal circulation and serpentinization. The measurements were performed at the ETH Zurich, Geological Institute from 2017 to 2020 using a FlashEA 1112 Elemental Analyzer (EA) interfaced via a Conflo IV to a Delta V Plus Isotope Ratio Mass Spectrometer for total carbon (TC) and total non-carbonate carbon (NCC) content and isotope composition, a CM 5012 CO2 coulometer interfaced with a CM 5130 Acidification Module for the total inorganic carbon (TIC) content, and a GasBench II connected to a Delta V Mass Spectrometer for the total inorganic carbon isotope composition. The Results are reported as replicates.